/*

 * Licensed to the Apache Software Foundation (ASF) under one

 * or more contributor license agreements.  See the NOTICE file

 * distributed with this work for additional information

 * regarding copyright ownership.  The ASF licenses this file

 * to you under the Apache License, Version 2.0 (the

 * "License"); you may not use this file except in compliance

 * with the License.  You may obtain a copy of the License at

 *

 *     http://www.apache.org/licenses/LICENSE-2.0

 *

 * Unless required by applicable law or agreed to in writing, software

 * distributed under the License is distributed on an "AS IS" BASIS,

 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

 * See the License for the specific language governing permissions and

 * limitations under the License.

 */

package com.bff.gaia.unified.runners.gaia.translation.wrappers.streaming;



import com.bff.gaia.unified.runners.core.KeyedWorkItem;

import com.bff.gaia.unified.runners.core.KeyedWorkItemCoder;

import com.bff.gaia.unified.sdk.coders.Coder;

import com.bff.gaia.unified.sdk.coders.CoderException;

import com.bff.gaia.unified.sdk.coders.StructuredCoder;

import com.bff.gaia.unified.sdk.transforms.windowing.BoundedWindow;

import com.bff.gaia.unified.sdk.util.WindowedValue;

import com.bff.gaia.unified.vendor.guava.com.google.common.collect.ImmutableList;



import java.io.IOException;

import java.io.InputStream;

import java.io.OutputStream;

import java.util.List;



/** Singleton keyed work item coder. */

public class SingletonKeyedWorkItemCoder<K, ElemT>

    extends StructuredCoder<SingletonKeyedWorkItem<K, ElemT>> {

  /**

   * Create a new {@link KeyedWorkItemCoder} with the provided key coder, element coder, and window

   * coder.

   */

  public static <K, ElemT> SingletonKeyedWorkItemCoder<K, ElemT> of(

      Coder<K> keyCoder, Coder<ElemT> elemCoder, Coder<? extends BoundedWindow> windowCoder) {

    return new SingletonKeyedWorkItemCoder<>(keyCoder, elemCoder, windowCoder);

  }



  private final Coder<K> keyCoder;

  private final Coder<ElemT> elemCoder;

  private final Coder<? extends BoundedWindow> windowCoder;

  private final WindowedValue.FullWindowedValueCoder<ElemT> valueCoder;



  private SingletonKeyedWorkItemCoder(

      Coder<K> keyCoder, Coder<ElemT> elemCoder, Coder<? extends BoundedWindow> windowCoder) {

    this.keyCoder = keyCoder;

    this.elemCoder = elemCoder;

    this.windowCoder = windowCoder;

    valueCoder = WindowedValue.FullWindowedValueCoder.of(elemCoder, windowCoder);

  }



  public Coder<K> getKeyCoder() {

    return keyCoder;

  }



  public Coder<ElemT> getElementCoder() {

    return elemCoder;

  }



  @Override

  public void encode(SingletonKeyedWorkItem<K, ElemT> value, OutputStream outStream)

      throws CoderException, IOException {

    encode(value, outStream, Context.NESTED);

  }



  @Override

  public void encode(

      SingletonKeyedWorkItem<K, ElemT> value, OutputStream outStream, Context context)

      throws CoderException, IOException {

    keyCoder.encode(value.key(), outStream);

    valueCoder.encode(value.value(), outStream, context);

  }



  @Override

  public SingletonKeyedWorkItem<K, ElemT> decode(InputStream inStream)

      throws CoderException, IOException {

    return decode(inStream, Context.NESTED);

  }



  @Override

  public SingletonKeyedWorkItem<K, ElemT> decode(InputStream inStream, Context context)

      throws CoderException, IOException {

    K key = keyCoder.decode(inStream);

    WindowedValue<ElemT> value = valueCoder.decode(inStream, context);

    return new SingletonKeyedWorkItem<>(key, value);

  }



  @Override

  public List<? extends Coder<?>> getCoderArguments() {

    return ImmutableList.of(keyCoder, elemCoder, windowCoder);

  }



  @Override

  public void verifyDeterministic() throws NonDeterministicException {

    keyCoder.verifyDeterministic();

    elemCoder.verifyDeterministic();

    windowCoder.verifyDeterministic();

  }



  /**

   * {@inheritDoc}.

   *

   * <p>{@link KeyedWorkItemCoder} is not consistent with equals as it can return a {@link

   * KeyedWorkItem} of a type different from the originally encoded type.

   */

  @Override

  public boolean consistentWithEquals() {

    return false;

  }

}